As of midnight Eastern Time today, Facebook began allowing admins of fan pages with 100 or more fans to register for vanity URLs or “usernames,” as Facebook calls them. So, if you’re an admin for a Facebook page, make sure to register your page soon at http://www.facebook.com/usernames to ensure that you get the one you want before it gets taken. There’s a link to “learn more” on that page if you need additional information about this feature.
Usernames have to be at least five characters long and can only contain alphanumeric characters. FYI, they don’t say there’s an upper limit on characters but I was unable to register “UniversityofWashington” so I had to go with “UofWA”—kind of annoying.
While you’re at it, be sure to register your personal Facebook profile too, if you haven’t already.